The oleoresin is an important forest produce of pine forests
in the world. The variation in the economics of resin tapping
(oleoresin yield, cost of production) and oleoresin quality is
influenced by method of tapping and chemical stimulants
used for tapping, diameter of trees. Resin flow, a typical
defense response in conifers, is controlled by various
environmental factors. Different concentrations of Ethephon,
sulphuric acid (isolated or in combination with CEPA) have
also been tested. Higher resin yields were associated with
summer, whereas rainy season had lower oleoresin yield.
Ethephon in combination with sulphuric acid enhanced the
oleoresin yield as compare to the isolated treatments. Trees
exposed to stimulant ethephon 10%+20% H2SO4 resulted in
higher oleoresin yields. Trees with larger diameter at breast
height (38-40 cm) yielded more oleoresin than their smaller
counterparts (30-32 cm). The oleoresin yield showed
significant increase with increment in diameter of boreholes.
In conclusion, cost reductions on resin tapping can be
achieved by adjusting concentration of chemical stimulant,
diameter of boreholes and managing subsets of trees in
specific fashion based on DBH ranges.
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